Rosemount Analytical Xmt Data sheet

Product Data Sheet

71-XMT/rev.K
June 2008

Solu Comp®Model Xmt

™

TWO-WIRE TRANSMITTERS FOR pH, ORP,
CONDUCTIVITY, OXYGEN, OZONE, AND
CHLORINE

Model Xmt™1Family of Two-wire Transmitters

• CHOICE OF COMMUNICATION PROTOCOLS:
HART

®2

or FOUNDATION®3Fieldbus

• CLEAR, EASY-TO-READ two-line display shows commissioning
menus and process measurement displays in English

• SIMPLE TO USE MENU STRUCTURE

• CHOICE OF PANEL OR PIPE/SURFACE MOUNTING

• NON-VOLATILE MEMORY retains program settings and calibration
data during power failures

• SIX LOCAL LANGUAGES — English, French, German, Italian, Spanish and Portuguese

FEATURES AND APPLICATIONS

The Solu Comp®4Model Xmt™ family of transmitters
can be used to measure pH, ORP, conductivity (using
either contacting or toroidal sensors), resistivity, oxygen
(ppm and ppb level), free chlorine, total chlorine, mono­chloramine and ozone in a variety of process liquids.
The Xmt is compatible with most Rosemount Analytical
sensors. See the Specification sections for details.

The transmitter has a rugged, weatherproof, corrosion­resistant enclosure (NEMA 4X and IP65). The panel
mount version fits standard ½ DIN panel cutouts, and
its shallow depth is ideally suited for easy mounting in
cabinet-type enclosures. A panel mount gasket is
included to maintain the weather rating of the panel.
Surface/pipe mount enclosure includes self-tapping
screws for surface mounting. A pipe mounting accesso­ry kit is available for mounting to a 2-inch pipe.

The transmitter has a two-line 16-character display.
Menu screens for calibrating and registering choices
are simple and intuitive. Plain language prompts guide

the user through the procedures. There are no service
codes to enter before gaining access to menus.

Two digital communication protocols are available:
HART®(model option -HT) and FOUNDATION®fieldbus
(model option -FF or FI). Digital communications allow
access to AMS (Asset Management Solutions). Use
AMS to set up and configure the transmitter, read
process variables, and troubleshoot problems from a
personal computer or host anywhere in the plant.

The seven-button membrane-type keypad allows local
programming and calibrating of the transmitter. The
HART®and FOUNDATION®fieldbus Model 375 commu­nicator can also be used for programming and calibrat­ing transmitters.

1 Xmt is a trademark of Rosemount Analytical.

2 HART is a registered trademark of the HART Communication Foundation.

3 FOUNDATION is a registered trademark of Fieldbus Foundation.

4 Solu Comp is a registered trademark of Rosemount Analytical.

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Model Xmt-P pH/ORP Transmitter

• CHANGING FROM pH TO ORP operation takes only seconds.

• AUTOMATIC TWO-POINT BUFFER CALIBRATION reduces errors.

• SOLUTION TEMPERATURE COMPENSATION converts measured pH to the pH at 25°C.

• CONTINUOUS DIAGNOSTICS monitor sensor performance and warn the user of failure
(FAULT) or approaching failure (WARNING).

Model Xmt-T Toroidal Conductivity Transmitter

• MEASURES CONDUCTIVITY, PERCENT CONCENTRATION, TOTAL DISSOLVED
SOLIDS, OR CUSTOM CURVE VARIABLE.

• AUTOMATIC TEMPERATURE SENSOR RECOGNITION simplifies start up.

• AUTOMATIC/MANUAL TEMPERATURE COMPENSATION ensures accurate monitoring
and control.

• BUILT-IN CONCENTRATION CURVES FOR 0-12% NaOH, 0-15% HCl, 0-20% NaCl, and
0-25% H

2SO4

, and 96.0-99.7% H2SO4.

• PROGRAMMABLE REFERENCE TEMPERATURE enables temperature compensation to
temperatures other than 25 degrees Celsius.

• AUTOMATIC COMPENSATION FOR SENSOR CABLE RESISTANCE improves accuracy
of high conductivity measurements.*

Model Xmt-C Contacting Conductivity Transmitter

• MEASURES CONDUCTIVITY, RESISTIVITY, TOTAL DISSOLVED SOLIDS, OR CUSTOM
CURVE VARIABLE.

• AUTOMATIC TEMPERATURE SENSOR RECOGNITION simplifies start up.

• AUTOMATIC COMPENSATION FOR SENSOR CABLE RESISTANCE improves accuracy
of high conductivity/ low resistivity measurements.*

• TEMPERATURE COMPENSATION ALGORITHMS include percent slope, ultra-pure water,
cation conductivity, and no compensation.

Model Xmt-A Amperometric Transmitter

• MEASURES dissolved oxygen (ppm and ppb level), free chlorine, total chlorine, monochlo­ramine, and ozone.

• SECOND INPUT FOR A pH SENSOR ALLOWS AUTOMATIC pH CORRECTION for free
chlorine measurement. No expensive, messy reagents needed.

• AUTOMATIC BUFFER RECOGNITION FOR pH CALIBRATION.

*Patent pending

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SPECIFICATIONS - GENERAL

Case: Polycarbonate (panel and surface/pipe mount).

NEMA 4X/CSA 4 (IP65)

Dimensions

Panel (code -10): 6.10 x 6.10 x 3.72 in.

(155 x 155 x 94.5 mm)
Surface/Pipe (code -11): 6.23 x 6.23 x 3.23 in.

(158 x 158 x 82 mm); see page 15 for dimen­sions of pipe mounting bracket.

Conduit openings: Accepts PG13.5 or 1/2 in.

conduit fittings

Ambient Temperature: 32 to 122°F (0 to 50°C).

Some degradation of display above 50°C.

Storage Temperature: -4 to 158°F (-20 to 70°C)

Relative Humidity: 10 to 90% (non-condensing)

Weight/Shipping Weight: 2 lb/3 lb (1 kg/1.5 kg)

Display: Two line, 16-character display. Character

height: 4.8 mm; first line shows process variable
(pH, ORP, conductivity, % concentration, oxygen,
ozone, chlorine, or monochloramine), second line
shows process temperature and output current.
For pH/chlorine combination, pH may also be
displayed. Fault and warning messages, when
triggered, alternate with temperature and output
readings.

During calibration and programming, messages,
prompts, and editable values appear on the
two-line display.

Temperature resolution: 0.1°C (≤99.9°C);

1°C (≥100°C)

Hazardous Location Approval: For details, see

specifications for the measurement of interest.

RFI/EMI: EN-61326

DIGITAL COMMUNICATIONS:

HART —

Power & Load Requirements: Supply voltage

at the transmitter terminals should be at least
12 Vdc. Power supply voltage should cover
the voltage drop on the cable plus the external
load resistor required for HART communications
(250 Ω minimum). Minimum power supply
voltage is 12 Vdc. Maximum power supply
voltage is 42.4 Vdc. The graph shows the
supply voltage required to maintain 12 Vdc
(upper line) and 30 Vdc (lower line) at the
transmitter terminals when the current is 22 mA.

Analog Output: Two-wire, 4-20 mA output with

superimposed HART

®3

digital signal. Fully

scalable over the operating range of the sensor.

Output accuracy: ±0.05 mA

FOUNDATION FIELDBUS —

Power & Load Requirements: A power supply

voltage of 9-32 Vdc at 13 mA is required.

Fieldbus Intrinsically Safe COncept/FISCO-

compliant versions of Model Xmt Foundation
Fieldbus transmitters are available.

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GENERAL SPECIFICATIONS FOR Xmt-A

Input ranges: 0-330 nA, 0.3-4µA, 3.7-30 µA,

27-100 µA

Repeatability (input): ±0.1% of range

Linearity (input): ±0.3% of range

Temperature range: -10 to 100°C (-10 to 150°C for

steam sterilizable sensors)

Temperature accuracy using RTD: ±0.5°C between

0 and 50°C, ±1°C above 50°C

Temperature accuracy using 22k NTC: ±0.5°C

between 0 and 50°C, ±2°C above 50°C

Digital Communications:

HART: PV, SV, TV, and 4V assignable to measure-

ment (oxygen, ozone, chlorine, or monochlo­ramine), temperature, pH, and sensor current.

Fieldbus: Four (4) AI blocks assignable to meas-

urement (oxygen, ozone, or chlorine), tempera­ture, pH, and sensor current; execution time 75
msec. One PID block; execution time 150 msec.
Device type: 4086. Device revision: 1. Certified to
ITK 4.6.

HAZARDOUS LOCATION APPROVALS

Intrinsic Safety (with appropriate safety barrier):

Class I, II, III, Div. 1
Groups A-G
T4 Tamb = 50°C

Class I, II, III, Div. 1
Groups A-G
T4 Tamb = 50°C

1180 II 1 G
Baseefa04ATEX0213X
EEx ia IIC T4
Tamb = 0°C to 50°C

Non-Incendive:

Class I, Div. 2, Groups A-D

Dust Ignition Proof

Class II & III, Div. 1, Groups E-G

NEMA 4/4X Enclosure

Class I, Div. 2, Groups A-D

Dust Ignition Proof

Class II & III, Div. 1, Groups E-G

NEMA 4/4X Enclosure

T4 Tamb = 50°C

MODEL Xmt-A AMPEROMETRIC TRANSMITTER

FEATURES

The Model Xmt-A Transmitter with the appropriate
sensor measures dissolved oxygen (ppm and ppb
level), free chlorine, total chlorine, monochloramine,
and ozone in water and aqueous solutions. The trans­mitter is compatible with Rosemount Analytical 499A
amperometric sensors for oxygen, chlorine, monochlo­ramine, and ozone; and with Hx438, Bx438, and
Gx448 steam-sterilizable oxygen sensors.

For free chlorine measurements, both automatic and
manual pH correction are available. pH correction is
necessary because amperometric free chlorine sen­sors respond only to hypochlorous acid, not free chlo­rine, which is the sum of hypochlorous acid and
hypochlorite ion. To measure free chlorine, most com­peting instruments require an acidified sample. Acid
lowers the pH and converts hypochlorite ion to
hypochlorous acid. The Model Xmt-A eliminates the
need for messy and expensive sample conditioning by

measuring the sample pH and using it to correct the
chlorine sensor signal. If the pH is relatively constant,
a fixed pH correction can be used, and the pH meas­urement is not necessary. If the pH is greater than 7.0
and fluctuates more than about 0.2 units, continuous
measurement of pH and automatic pH correction is
necessary. See Specifications section for recommend­ed pH sensors. Corrections are valid to pH 9.5.

The transmitter fully compensates oxygen, ozone, free
chlorine, total chlorine, and monochloramine readings
for changes in membrane permeability caused by tem­perature changes.

For pH measurements — pH is available with free
chlorine only — the Xmt-A features automatic buffer
recognition and stabilization check. Buffer pH and
temperature data for commonly used buffers are
stored in the transmitter. Glass impedance diagnostics
warn the user of an aging or failed pH sensor.

ATEX

MODEL Xmt-A AMPEROMETRIC TRANSMITTER

SPECIFICATIONS — OXYGEN

Measurement Range: 0-20 ppm (mg/L),

or equivalent partial pressure or % saturation
(limited by sensor)

Units: ppm, ppb, % saturation, partial pressure

(mmHg, inHg, atm, mbar, bar, kPa)

Resolution: 4 digits. Position of decimal point

depends on units selected

for partial pressure (x.xxx to xxxx)

for % saturation (fixed at xxx.x%)

for ppm (fixed at xx.xx ppm) =,

for ppb (fixed at xxx.x ppb, changes to 1.00 ppm
when ppb reading exceeds 999.9 ppb) =,xxxxppm

Temperature correction for membrane permeability:

automatic between 0 and 50°C (can be disabled)

Calibration: air calibration (user must enter baromet-

ric pressure) or calibration against a standard
instrument

SENSORS — OXYGEN:

Model 499A DO-54, 499A DO-54-VP for ppm level

Model 499A TrDO-54, 499A TrDO-54-VP for ppb level

Hx438, Bx438, and Gx448 steam-sterilizable oxygen
sensors

SPECIFICATIONS — FREE CHLORINE

Measurement Range: 0-20 ppm (mg/L) as Cl

2

(limited by sensor)

Resolution: 0.001 ppm (Autoranges at 0.999 to 1.00

and 9.99 to 10.0)

Temperature correction for membrane permeability:

automatic between 0 and 50°C (can be disabled)

pH Correction: Automatic between pH 6.0 and 9.5.

Manual pH correction is also available.

Calibration: against grab sample analyzed using

portable test kit.

SENSORS — FREE CHLORINE:

Model 499A CL-01-54, 499A CL-01-54-VP

SPECIFICATIONS — TOTAL CHLORINE

Measurement Range: 0-20 ppm (mg/L) as Cl

2

(limited by sensor)

Resolution: 0.001 ppm (Autoranges at 0.999 to 1.00

and 9.99 to 10.0)

Temperature correction for membrane permeability:

automatic between 5 and 35°C (can be disabled)

Calibration: against grab sample analyzed using

portable test kit.

SENSOR — TOTAL CHLORINE:

Model 499A CL-02-54 (must be used with SCS 921A)

SPECIFICATIONS — pH

Application: pH measurement available with free

chlorine only

Measurement Range: 0-14 pH

Resolution: 0.01 pH

Sensor Diagnostics: Glass impedance (for broken

or aging electrode) and reference offset.
Reference impedance (for fouled reference junc­tion) is not available.

Repeatability: ±0.01 pH at 25°C

SENSORS — pH:

Use Model 399-09-62, 399-14, or 399VP-09.

SPECIFICATIONS — MONOCHLORAMINE

Measurement Range: 0-20 ppm (mg/L) as Cl

2

(limited by sensor)

Resolution: 0.001 ppm (Autoranges at 0.999 to 1.00

and 9.99 to 10.0)

Temperature correction for membrane permeability:

automatic between 5 and 35°C (can be disabled)

Calibration: against grab sample analyzed using

portable test kit.

SENSORS — MONOCHLORAMINE:

Model 499A CL-03-54, 499A CL-03-54-VP

SPECIFICATIONS — OZONE

Measurement Range: 0-10 ppm (mg/L) (limited by

sensor)

Units: ppm and ppb

Resolution:

for ppm: x.xxx to xxxx

for ppb: xxx.x to xxxx

Temperature correction for membrane permeability:

automatic between 5 and 35°C (can be disabled)

Calibration: against grab sample analyzed using

portable test kit.

SENSORS — OZONE:

Model 499A OZ-54, 499A OZ-54-VP

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